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Re-establishment of fish passage for conserving threatened migratory species of West-Indian Himalayas

Raut, Shailendra; Gupta, Nishikant; Nautiyal, Prakash; Everard, Mark


Shailendra Raut

Nishikant Gupta

Prakash Nautiyal

Mark Everard
Associate Professor in Ecosystem Services


Fish passes are structures (natural or manmade) bypassing barriers (e.g., dams), enabling satisfactory movement of migratory fish species. Reestablishment of fish passage, including facilitating overcoming barriers presented by impoundments or restoration of defunct structures, is attracting interest among scientists and policymakers as a mechanism to enable recovery of target fish species or fish communities. However, it is also important to note that fish passes may also act as ecological traps in some large neotropical rivers. A diversity of multispecies fish passage designs have been implemented in North and South America, Europe, and Australia, with varying efficacy for different species. However, field surveys between 2010 and 2018 supported by a review of published literature (N = 217) using Google Scholar search engine using six key terms reveal that few fish passes have been constructed in dams in the Indian Himalayan region, and their efficacy is largely unproven. Major problems associated with fish pass designs include uneven success across a range of species and largely untested effectiveness at the large scale of many major dams. The objective of this paper is to stress upon the requirement of a new approach to understand the operational drawbacks of different types of fish pass and to take an adaptive approach to both design and operation using field data to improve fish pass efficiency. These measures could contribute significantly to the conservation of threatened migratory fish in the increasingly impounded rivers of the Indian Himalayan region.


Raut, S., Gupta, N., Nautiyal, P., & Everard, M. (2020). Re-establishment of fish passage for conserving threatened migratory species of West-Indian Himalayas. River Research and Applications, 36(2), 314-317.

Journal Article Type Article
Acceptance Date Dec 2, 2019
Online Publication Date Dec 18, 2019
Publication Date Feb 1, 2020
Deposit Date Dec 2, 2019
Publicly Available Date Dec 19, 2020
Journal River Research and Applications
Print ISSN 1535-1459
Electronic ISSN 1535-1467
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 36
Issue 2
Pages 314-317
Keywords Fish pass; Himalayas; alien species; hydropower
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Re-establishment of fish passage for conservation of threatened migratory species of Western Indian Himalayan river systems (614 Kb)


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This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

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